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Manage Claude Code binary versions. Binaries are downloaded from Anthropic’s official distribution with SHA256 checksum verification.

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install

Download and install a Claude Code version.
If the version is already installed, it’s a no-op. Downloads show a progress bar. When you use -c latest in cac env create, the version is resolved and auto-installed — you don’t need to run install first.

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ls

List all installed Claude Code versions.
Shows which version is marked as latest, how many environments use each version, and the system-installed Claude Code path if present.

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pin

Pin the current active environment to a specific version.
This writes the version to ~/.cac/envs/<name>/version. The wrapper resolves this file at launch time, so the change takes effect on the next claude invocation.

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uninstall

Remove an installed version. Fails if any environment is using it.
You cannot uninstall a version that is pinned by any environment. Remove or re-pin those environments first.